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                <h2 id="数据库连接池"><a href="#数据库连接池" class="headerlink" title="数据库连接池"></a>数据库连接池</h2><ol>
<li><p>概念：其实就是一个容器（集合），存放数据库连接的容器<br> 当系统初始化好后，容器被创建，容器中会申请一些连接对象，当用户来访问数据库时，<br> 从容器中获取连接对象，用户访问完之后，会将连接对象归还给容器</p>
</li>
<li><p>好处： 1. 节约资源 2. 用户访问高效</p>
</li>
</ol>
<span id="more"></span>

<ol start="3">
<li><p>实现：</p>
<ol>
<li>标准接口：DataSource javax.sql报包下<ol>
<li><p>方法:<br> 获取连接: getConnection()<br> 归还连接:如果连接对象Connection是从连接池中获取的,那么调用Connection.close()方法不会再关闭连接,而是归还连接</p>
</li>
<li><p>一般我们不去实现它,有数据库厂商来实现</p>
<ol>
<li>C3P0: 数据库连接池技术</li>
<li>Druid: 数据库连接池技术,由阿里巴巴提供</li>
</ol>
</li>
</ol>
</li>
</ol>
</li>
<li><p>C3P0:<br>步骤1. 导入jar包c3p0-0.9.5.2.jar和mchange-commons-java-0.2.12.jar,同时不要忘记导入数据库驱动jar包</p>
<ol start="2">
<li><p>定义配置文件<br> 名称必须是 c3p0.properties 或者 c3p0-config.xml<br> 路径: 直接将文件放在src目录下<br> <property name="driverClass">com.mysql.cj.jdbc.Driver</property><br> <property name="jdbcUrl">jdbc:mysql:&#x2F;&#x2F;localhost:3306&#x2F;lovelycc?serverTimezone&#x3D;GMT%2B8</property><br> <property name="user">root</property><br> <property name="password">root</property><br> 各参数要根据自己配置改</p>
</li>
<li><p>创建核心对象 数据库连接池对象 ComboPooledDataSource</p>
</li>
<li><p>获取连接: getConnection</p>
</li>
</ol>
</li>
</ol>
<h2 id="public-class-C3P0Demo1-public-static-void-main-String-args-throws-SQLException-x2F-x2F-1-创建数据库连接池对象-不传参数-使用默认配置-x2F-x2F-可以添加不同的配置-通过-new-ComboPooledDataSource-“otherc3p0”-创建-DataSource-ds-x3D-new-ComboPooledDataSource-x2F-x2F-2-获取连接对象-for-int-i-x3D-0-i-lt-11-i-Connection-connection-x3D-ds-getConnection-System-out-println-i-”-”-connection-if-i-x3D-x3D-5-connection-close"><a href="#public-class-C3P0Demo1-public-static-void-main-String-args-throws-SQLException-x2F-x2F-1-创建数据库连接池对象-不传参数-使用默认配置-x2F-x2F-可以添加不同的配置-通过-new-ComboPooledDataSource-“otherc3p0”-创建-DataSource-ds-x3D-new-ComboPooledDataSource-x2F-x2F-2-获取连接对象-for-int-i-x3D-0-i-lt-11-i-Connection-connection-x3D-ds-getConnection-System-out-println-i-”-”-connection-if-i-x3D-x3D-5-connection-close" class="headerlink" title="public class C3P0Demo1 {    public static void main(String[] args) throws SQLException {        &#x2F;&#x2F;1. 创建数据库连接池对象,不传参数,使用默认配置.        &#x2F;&#x2F; 可以添加不同的配置,通过 new ComboPooledDataSource(“otherc3p0”)创建        DataSource ds &#x3D; new ComboPooledDataSource();        &#x2F;&#x2F;2. 获取连接对象        for (int i &#x3D; 0; i &lt; 11; i++) {            Connection connection &#x3D; ds.getConnection();            System.out.println(i+”:”+ connection);            if (i&#x3D;&#x3D;5){                connection.close();            }        }    }}"></a>public class C3P0Demo1 {<br>    public static void main(String[] args) throws SQLException {<br>        &#x2F;&#x2F;1. 创建数据库连接池对象,不传参数,使用默认配置.<br>        &#x2F;&#x2F; 可以添加不同的配置,通过 new ComboPooledDataSource(“otherc3p0”)创建<br>        DataSource ds &#x3D; new ComboPooledDataSource();<br>        &#x2F;&#x2F;2. 获取连接对象<br>        for (int i &#x3D; 0; i &lt; 11; i++) {<br>            Connection connection &#x3D; ds.getConnection();<br>            System.out.println(i+”:”+ connection);<br>            if (i&#x3D;&#x3D;5){<br>                connection.close();<br>            }<br>        }<br>    }<br>}</h2><ol start="5">
<li>Druid<br>步骤1. 导入jar包druid-1.0.9.jar<ol start="2">
<li><p>定义配置文件:</p>
<ol>
<li>properties形式</li>
<li>可以叫任意名称,放在任意目录下</li>
</ol>
</li>
<li><p>获取数据库连接池对象: 通过工厂来获取 DruidDataSourceFactory.createDataSource(pro)</p>
</li>
<li><p>获取连接: ds.getConnection()<br>public class DruidDemo {<br> public static void main(String[] args) throws Exception {<br> &#x2F;&#x2F;1. 导入jar包<br> &#x2F;&#x2F;2. 定义配置文件<br> &#x2F;&#x2F;3. 加载配置文件<br> Properties pro &#x3D; new Properties();<br> InputStream is &#x3D; DruidDemo.class.getClassLoader().getResourceAsStream(“druid.properties”);<br> pro.load(is);</p>
<p> &#x2F;&#x2F;4. 获取连接池对象<br> DataSource ds &#x3D; DruidDataSourceFactory.createDataSource(pro);<br> &#x2F;&#x2F;5. 获取连接<br> Connection connection &#x3D; ds.getConnection();<br> System.out.println(connection);</p>
</li>
</ol>
<p> }</p>
</li>
</ol>
<p>}</p>
<p>定义工具类:<br>    1. 定义一个类 JDBCUtils<br>    2. 提供静态代码块加载配置文件,初始化连接池对象<br>    3. 提供方法<br>        1. 获取连接方法: 通过连接池获取连接<br>        2. 释放资源<br>        3. 获取连接池的方法</p>
<p>&#x2F;*<br>    Druid连接池的工具类<br> *&#x2F;<br>public class JDBCUtils2 {<br>    &#x2F;&#x2F;1. 定义成员变量 DataSource<br>    private static DataSource ds;<br>    static{<br>        try {<br>            &#x2F;&#x2F;1. 加载配置文件<br>            Properties pro &#x3D; new Properties();<br>            pro.load(DruidDemo.class.getClassLoader().getResourceAsStream(“druid.properties”));<br>            &#x2F;&#x2F;2. 获取DataSource<br>            ds &#x3D; DruidDataSourceFactory.createDataSource(pro);</p>
<pre><code>    &#125; catch (Exception e) &#123;
        e.printStackTrace();
    &#125;
&#125;

/*
    获取连接
 */
public static Connection getConnection() throws SQLException &#123;
    return ds.getConnection();
&#125;

/*
    释放资源
 */
public static void close(ResultSet res, Statement stmt, Connection conn)&#123;
    if(res != null)&#123;
        try &#123;
            res.close();
        &#125; catch (SQLException e) &#123;
            e.printStackTrace();
        &#125;
    &#125;
    if(stmt != null)&#123;
        try &#123;
            stmt.close();
        &#125; catch (SQLException e) &#123;
            e.printStackTrace();
        &#125;
    &#125;
    if(conn != null)&#123;
        try &#123;
            conn.close();
        &#125; catch (SQLException e) &#123;
            e.printStackTrace();
        &#125;
    &#125;
&#125;

//重载方法
public static void close(Statement stmt, Connection conn)&#123;
    close(null,stmt,conn);
&#125;

/*
    获取连接池的方法
 */

public static DataSource getDataSource()&#123;
    return ds;
&#125;
</code></pre>
<h2 id=""><a href="#" class="headerlink" title="}"></a>}</h2><p>public class DruidDemo2 {<br>    public static void main(String[] args) throws SQLException {</p>
<pre><code>/*
    完成添加操作,给account表添加一条记录
 */

    Connection connection = null;
    PreparedStatement pstmt = null;
    //1. 获取连接
     connection = JDBCUtils2.getConnection();
    //2. 定义sql
    String sql = &quot;insert into account values(0,?,?)&quot;;
    //3. 获取pstmt对象
    pstmt = connection.prepareStatement(sql);
    //4. 给?赋值
    pstmt.setString(1,&quot;傅红雪&quot;);
    pstmt.setDouble(2,1000.99);
    //5. 执行sql
    pstmt.executeUpdate();
&#125;
</code></pre>
<p>}</p>
<h2 id="Spring-JDBC"><a href="#Spring-JDBC" class="headerlink" title="Spring JDBC"></a>Spring JDBC</h2><pre><code>Spring框架对JDBC的简单封装
提供了一个JDBCTemplate对象简化JDBC的开发
步骤: 
    1. 导入jar包
    2. 创建JdbcTemplate对象.依赖数据源DataSource
        JdbcTemplate template = new JdbcTemplate(ds);
    3. 调用方法JdbcTemplate的方法来完成CRUD(增删改查)的操作
        update(): 执行DML语句,增删改
        queryForMap(): 查询结果将结果封装为map集合,
            将列名作为key,将值作为value 将记录封装为一个map集合&lt;String,Object&gt;
        queryForList(): 查询结果将结果封装为List集合
            将每一条记录封装为一个Map集合,再将Map集合装载到List集合中
        query(): 查询结果, 将结果封装为JavaBean对象
            query的参数: RowMapper
                一般使用BeanPropertyRowMapper&lt;&gt;(Hero.class)实现类,可以完成数据到javaBean的自动封装
        queryForObject: 查询结果,将结果封装为对象
            一般用于聚合函数的查询
        
</code></pre>
<h2 id="x2F-JdbcTemplate入门-x2F-public-class-JdbcTemplateDemo1-public-static-void-main-String-args-x2F-x2F-1-导入jar包-x2F-x2F-2-创建JdbcTemplate对象-可以传入一个DataSource对象-JdbcTemplate-template-x3D-new-JdbcTemplate-JDBCUtils2-getDataSource-x2F-x2F-3-调用方法-String-sql-x3D-“update-account-set-balance-x3D-5000-where-name-x3D-”-int-count-x3D-template-update-sql-“西门吹雪”-System-out-println-count"><a href="#x2F-JdbcTemplate入门-x2F-public-class-JdbcTemplateDemo1-public-static-void-main-String-args-x2F-x2F-1-导入jar包-x2F-x2F-2-创建JdbcTemplate对象-可以传入一个DataSource对象-JdbcTemplate-template-x3D-new-JdbcTemplate-JDBCUtils2-getDataSource-x2F-x2F-3-调用方法-String-sql-x3D-“update-account-set-balance-x3D-5000-where-name-x3D-”-int-count-x3D-template-update-sql-“西门吹雪”-System-out-println-count" class="headerlink" title="&#x2F;*    JdbcTemplate入门 *&#x2F;public class JdbcTemplateDemo1 {    public static void main(String[] args) {        &#x2F;&#x2F;1. 导入jar包        &#x2F;&#x2F;2. 创建JdbcTemplate对象,可以传入一个DataSource对象        JdbcTemplate template &#x3D; new JdbcTemplate(JDBCUtils2.getDataSource());        &#x2F;&#x2F;3. 调用方法        String sql &#x3D; “update account set balance &#x3D; 5000 where name &#x3D; ?”;        int count &#x3D; template.update(sql, “西门吹雪”);        System.out.println(count);    }}"></a>&#x2F;*<br>    JdbcTemplate入门<br> *&#x2F;<br>public class JdbcTemplateDemo1 {<br>    public static void main(String[] args) {<br>        &#x2F;&#x2F;1. 导入jar包<br>        &#x2F;&#x2F;2. 创建JdbcTemplate对象,可以传入一个DataSource对象<br>        JdbcTemplate template &#x3D; new JdbcTemplate(JDBCUtils2.getDataSource());<br>        &#x2F;&#x2F;3. 调用方法<br>        String sql &#x3D; “update account set balance &#x3D; 5000 where name &#x3D; ?”;<br>        int count &#x3D; template.update(sql, “西门吹雪”);<br>        System.out.println(count);<br>    }<br>}</h2><p>练习:<br>    需求:<br>        1. 修改李寻欢身高178<br>        2. 添加一条记录<br>        3. 删除刚才添加的记录<br>        4. 查询id为1的记录,将其封装为Map集合<br>        5. 查询所有的记录,将其封装为List<br>        6. 查询所有的记录,将其封装为Hero对象的List集合<br>        7. 查询总记录数</p>
<p>public class JdbcTemplateDemo2 {<br>    &#x2F;&#x2F;junit单元测试,可以让方法独立执行</p>
<pre><code>//1. 获取JdbcTemplate对象
private JdbcTemplate template = new JdbcTemplate(JDBCUtils2.getDataSource());

// update执行增删改语句
@Test
public void test1()&#123;

    //2. 定义sql
    String sql = &quot;update hero set height = ? where name = ?&quot;;
    //3. 执行sql
    int count = template.update(sql,178,&quot;李寻欢&quot;);
    System.out.println(count);
&#125;

@Test
public void test2()&#123;
    String sql = &quot;insert into hero values(0,?,?,?,?)&quot;;
    template.update(sql,&quot;傅红雪&quot;,20,65,175);
&#125;

@Test
public void test3()&#123;
    String sql = &quot;delete from hero where name = ?&quot;;
    template.update(sql,&quot;傅红雪&quot;);
&#125;

//查询query
//4. 查询id为1的记录,将其封装为Map集合
@Test
public void test4()&#123;
    String sql = &quot;select * from hero where id = ?&quot;;
    Map&lt;String,Object&gt; map = template.queryForMap(sql,1);
    System.out.println(map);//&#123;ID=1, name=呈呈, age=18, weight=57.0, height=160.0&#125;
&#125;

@Test
//5. 查询所有的记录,将其封装为List
public void test5()&#123;
    String sql = &quot;select * from hero &quot;;
    List&lt;Map&lt;String,Object&gt;&gt; list = template.queryForList(sql);
    for (Map&lt;String, Object&gt; stringObjectMap : list) &#123;
        System.out.println(stringObjectMap);
    &#125;
&#125;

//6. 查询所有的记录,将其封装为Hero对象的List集合
@Test
public void test6()&#123;
    String sql = &quot;select * from hero &quot;;

    // 自己实现的RowMapper&lt;Hero&gt;()类
</code></pre>
<p>&#x2F;&#x2F;		List<Hero> list &#x3D; template.query(sql, new RowMapper<Hero>() {<br>&#x2F;&#x2F;			@Override<br>&#x2F;&#x2F;			public Hero mapRow(ResultSet resultSet, int i) throws SQLException {<br>&#x2F;&#x2F;				Hero hero &#x3D; new Hero();<br>&#x2F;&#x2F;				int id &#x3D; resultSet.getInt(“id”);<br>&#x2F;&#x2F;				String name &#x3D; resultSet.getString(“name”);<br>&#x2F;&#x2F;				int age &#x3D; resultSet.getInt(“age”);<br>&#x2F;&#x2F;				double weight &#x3D; resultSet.getDouble(“weight”);<br>&#x2F;&#x2F;				double height &#x3D; resultSet.getDouble(“height”);<br>&#x2F;&#x2F;<br>&#x2F;&#x2F;				hero.setId(id);<br>&#x2F;&#x2F;				hero.setName(name);<br>&#x2F;&#x2F;				hero.setAge(age);<br>&#x2F;&#x2F;				hero.setWeight(weight);<br>&#x2F;&#x2F;				hero.setHeight(height);<br>&#x2F;&#x2F;<br>&#x2F;&#x2F;				return hero;<br>&#x2F;&#x2F;			}<br>&#x2F;&#x2F;		});</p>
<pre><code>    //别人实现好的
    List&lt;Hero&gt; list = template.query(sql, new BeanPropertyRowMapper&lt;&gt;(Hero.class));
    for (Hero hero : list) &#123;
        System.out.println(hero);
    &#125;
&#125;

//7. 查询总记录数
@Test
public void test7()&#123;
    String sql = &quot;select count(id) from hero &quot;;
    Long total = template.queryForObject(sql, Long.class);
    System.out.println(total);
&#125;
</code></pre>
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    var searchFunc = function (path, search_id, content_id) {
        'use strict';
        $.ajax({
            url: path,
            dataType: "xml",
            success: function (xmlResponse) {
                // get the contents from search data
                var datas = $("entry", xmlResponse).map(function () {
                    return {
                        title: $("title", this).text(),
                        content: $("content", this).text(),
                        url: $("url", this).text()
                    };
                }).get();
                var $input = document.getElementById(search_id);
                var $resultContent = document.getElementById(content_id);
                $input.addEventListener('input', function () {
                    var str = '<ul class=\"search-result-list\">';
                    var keywords = this.value.trim().toLowerCase().split(/[\s\-]+/);
                    $resultContent.innerHTML = "";
                    if (this.value.trim().length <= 0) {
                        return;
                    }
                    // perform local searching
                    datas.forEach(function (data) {
                        var isMatch = true;
                        var data_title = data.title.trim().toLowerCase();
                        var data_content = data.content.trim().replace(/<[^>]+>/g, "").toLowerCase();
                        var data_url = data.url;
                        data_url = data_url.indexOf('/') === 0 ? data.url : '/' + data_url;
                        var index_title = -1;
                        var index_content = -1;
                        var first_occur = -1;
                        // only match artiles with not empty titles and contents
                        if (data_title !== '' && data_content !== '') {
                            keywords.forEach(function (keyword, i) {
                                index_title = data_title.indexOf(keyword);
                                index_content = data_content.indexOf(keyword);
                                if (index_title < 0 && index_content < 0) {
                                    isMatch = false;
                                } else {
                                    if (index_content < 0) {
                                        index_content = 0;
                                    }
                                    if (i === 0) {
                                        first_occur = index_content;
                                    }
                                }
                            });
                        }
                        // show search results
                        if (isMatch) {
                            str += "<li><a href='" + data_url + "' class='search-result-title'>" + data_title + "</a>";
                            var content = data.content.trim().replace(/<[^>]+>/g, "");
                            if (first_occur >= 0) {
                                // cut out 100 characters
                                var start = first_occur - 20;
                                var end = first_occur + 80;
                                if (start < 0) {
                                    start = 0;
                                }
                                if (start === 0) {
                                    end = 100;
                                }
                                if (end > content.length) {
                                    end = content.length;
                                }
                                var match_content = content.substr(start, end);
                                // highlight all keywords
                                keywords.forEach(function (keyword) {
                                    var regS = new RegExp(keyword, "gi");
                                    match_content = match_content.replace(regS, "<em class=\"search-keyword\">" + keyword + "</em>");
                                });

                                str += "<p class=\"search-result\">" + match_content + "...</p>"
                            }
                            str += "</li>";
                        }
                    });
                    str += "</ul>";
                    $resultContent.innerHTML = str;
                });
            }
        });
    };

    searchFunc('/shiqing/search.xml', 'searchInput', 'searchResult');
});
</script>

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